Return-Path: Received: from smtp7.gateway.net ([208.230.117.251]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Tue, 19 Sep 2000 01:49:45 -0400 Received: from oemcomputer (1Cust97.tnt2.coeur-dalene.id.da.uu.net [63.20.49.97]) by smtp7.gateway.net (8.9.3/8.9.3) with SMTP id BAA05354 for ; Tue, 19 Sep 2000 01:56:34 -0400 (EDT) Message-ID: <000701c02200$13b2c040$6131143f@oemcomputer> Reply-To: "dfs" Reply-To: lancair.list@olsusa.com From: "dfs" To: "Lancair List" Subject: 235 wings Date: Mon, 18 Sep 2000 23:08:22 -0700 X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Bryan: The glass used on the 235 wing skins (and probably the other models as well) is re-impregnated at the manufacturer with the optimum amount of resin and then frozen to stall the cure of the epoxy. Once layed into the molds, in the proper sequence, e.g., fiber glass - foam - fiber glass, a airtight plastic sheet is layed over the assembly and a vacuum is drawn to suck the plastic down tight against the sandwich and force the layers into the female form. This sheet of plastic also provides uniform pressure over the entire inner layer to insure the required tight contact between the layers so that all surfaces will bond. Beneath the plastic, numerous batts of a fibrous material is distributed about the inner skins to provide an air path to the suction point, insuring that the plastic bag is tight against all parts of the skin surface (no bubbles). After this is done, the entire assembly is placed in an autoclave and cured at an elevated temperature. The result is a perfectly molded part with closely controlled properties. It is highly unlikely that you could produce acceptable Lancair wing skins with anything approaching the required strength, using anything less than the original methodology. In my opinion, trying to make such components using a wet lay-up is totally unacceptable, regardless of how accurate your molds might be. Just one person's opinion. Dan Schaefer >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>